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<head>
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    <title>Document</title>
    <script src="../jquery-3.3.1.min.js"></script>
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</head>

<body>
    <div id="app">
        <input type="text" v-color='msg'>
    </div>

    <script>
        Vue.directive('color', {
            bind: function(el, binding) {
                el.style.backgroundColor = binding.value.color;
            }
        });
        var vm = new Vue({
            el: "#app",
            data: {
                msg: {
                    color: 'blue'
                }
            },
            methods: {
                handle: function() {

                }
            }
        });
    </script>
</body>

</html>